Safety controller handle



c. c. FARMER Filed Dec. 1. 1921- IIIIHH IHUI III I ||||HIII PatentedSept. 30, 1924 UNITED STATES PATENT FFlE.

CLYDE C. FARMER, 0E PITTSBURGH, PENNSYLVANIA, ASEwIGNOB TO THE TESTING-HOUSE AIR BRAKE COMPANY, 015 VJILMERDING, FPENNSYLVANIA, A GORIPORATIONOF PENNSYLVANIA.

SAFETY CONTROLLER, HANDLE.

Application filed December 1, 1921.

To all whom it may concern.

Be it known that I, Cums C. FARMER, a citizen of the United States,residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements in SafetyController Handles, of which the following is a specification.

This invention relates to electric car mo tor controllers in which asafety controller handle is provided such that the release of thecontroller handle operates to automatically cause an application of thebrakes and the opening of the power circuit.

The principal object of my invention is to provide an adapter unit bywhich a standard safety controller handle unit may be applied to motorcontrollers of different types without altering the motor controllerconstruction or the safety controller handle unit.

In the accompanying drawing, the single figure is a vertical section ofthe upper portion of a motor controller with a safety controller handleapplied thereto in accordance with my invention.

In the drawing, the reference numeral 1 indicates the top plate of anelectric motor controller and in the particular type of controllershown, the plate 1 is provided with a central sleeve portion 2 throughwhich the controller shaft 3 extends. The upper end of the shaft 3 isprovided with pins 4: which, in the ordinary controller. are adapted toengage in corresponding holes in the controller handle when the same isapplied to the controller. The sleeve portion 2 is provided with anannular groove 5 for receiving the end of a set screw by which thehandle is held in position on the controller shaft. A yielding stopdevice 6 is also provided, which yieldingly engages notches in thecontroller handle for defining the different operating positionsthereof.

Accordingto my invention, in order to apply a safety controller handleunit to the controller without requiring alteration of the handle unitor the controller, an adapter is provided, which may comprise anextension shaft member 7. An adapter is designed for each differing typeof motor controller, so that the adapter may be applied to thecontroller in place of the usual controller handle.

Serial No. 519,170.

In the particular type of controller shown in the drawing, as anexample, the adapter is provided with a socket adapted to fit over thesleeve portion 2 and bores adapted to register with the pins l, andcorresponding with the construction of the ordinary con troller handle.A set screw 8, having screwthrea'ded engagementin the member 7, isscrewed down, after the extension shaft is applied, so that the end ofthe screw engages in the groove 5, to hold the shaft in posi tion andthe extension shaft is also provided with notches, corresponding withthe notches on the usual controller handle, for cooperation with theyielding stop device 6.

The standard controller handle unit may comprise main casting 9, towhich is ap plied a housing base and in which is mounted a controllerhandle 11, the release of which is adapted to effect an application ofthe brakes and the opening of the power circuit in the well knownmanner. The extension shaft 7 is provided with a key section 12, and themain casting of the safety controller handle unit with a key aperturefor receiving the key section 12. The housing base 10 may be secured tothe yielding stop housing 13 of the controller by means of one or morescrews 14E and then the controller handle unit may be applied to the keysection 12. i

It will be evident that different adapters may be provided forapplication to various types of motor controllers in place of the usualcontroller handle, each adapter, however, having the same key section bywhich a standard safety controller handle may be applied to thecontroller without alteration.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is v The combination with an electric motorcontroller having means for receiving the usual controller handle, of anextension shaft constructed for application in place of the usualcontroller handle and provided with a key section, and a safetycontroller handle unit having a key aperture for receiving the keysection of the extension shaft.

In testimony whereof I have hereunto set my hand.

CLYDE C. FARMER.

